Hello,
I encountered the same problem with the campaign that I started and finshed last week with DCS 2.7.
On the first real mission I sent a cap to bravo and one in charlie with 10*aim-120c+fuel, and two SEAD with 4*harm+fuel. Result: a LOT of enemies planes downed, Air sup 20%, Liberated aread 25% Ground op 1%. (code at end = HHEAHZ) From here I encountered only 2migs-29 in every mission, that were quickly disposed by a lone bravo cap.
After the 2nd mission Air sup 6%, Liberated aread 25% Ground op 88% (EHFGCM)
Then Air sup 20%, Liberated aread 37.5% Ground op 1% (HCEABU)
Then Air sup 40%, Liberated aread 50% Ground op 1% with very bad weather. (DDEAIR)
At the end of this mission, I had the "end of mission bug", that is not related to this campaign. But it means that every mission from there was done with the bad weatHer (clouds from about 4000 to 20000 feet), so I did only drop JDAM/AGM154-C using targets coordinates from the F10 map. The good thing about it is I'm a pro at doing precision instruments case3 approach now.
Then Air sup 60%, Liberated aread 62.5% Ground op 1% (JIEAJZ)
Then Air sup 60%, Liberated aread 75% Ground op 1% (JJEABK)
Then Air sup 60%, Liberated aread 75% Ground op 50% (JJIAGK)
Then Air sup 70%, Liberated aread 87.5% Ground op 1% (BBEAFZ)
Then Air sup 70%, Liberated aread 87.5% Ground op 70% (BBBAAQ)
Then Air sup 60%, Liberated aread 100% Ground op 1% (JGEAKK)
Then Air sup 60%, Liberated aread 100% Ground op 70% (JGBAOP)
Then after a last mission: campaing victory.
What I found quite disturbing is that the group assigned to strike were only destroying a few targets, and then were retreating with >=80% of the bombs when plenty of ground targets were remaining in their attack zone. (I was giving each plane 8various bombs+fuel+laserpod)
From about the middle of the campain until the end, CAS assigned group were not dropping a single bomb.
Also in the mission editor, the player group is assigned with CAP, and I think that prevent the wingman to really attack ground targets or air defense, since he think his task is CAP. It was were rare to get him to drop bombs. So the best use was to give him 10*aim120-c+fuel and tell him to go searching bandits, even if the lone bravo cap was totally sufficient dealing with the very few ennemies planes. Another thing is that even if you give bombs or AGM65 and such to the SEAD flight, they do not use it. They only fire HARMs to SAM with great coverage. The won't chase down smaller coverage SAMs even if they encounter those.
I wonder if to get more planes, one should send a flight of 10 planes north of bravo with 6aim-120c+3fuel each? Because on the debriefing it was always written about 4/39 ennemies planes killed. So I bet quite a lot of red planes are idling on the ground.
I'm sure the intended campaign experience wasn't just to mark the strike target on the mission editor, take-off, rise to 20000, drop a single AGM154-C, and go back to the mother, so perhaps a late DCS update broke everything
Best regards,
Z0mb13